Noble Gas Configuration
What are Noble Gases
A. Noble gases are found in group 8A
B. The elements are called noble because
they are non-reactive and very stable.
C. The do not tend to form compounds
Why would we call
them noble gasses?
Why are they nonreactive?
What do they have
in common?
What is the goal of
each atom?
Complete Electron
Configuration
A. What is the electron configuration for Ne?
B. Ne: 1s22s22p6
C. What is the electron configuration for
Mg?
D. Mg: 1s22s22p63s2
E. What do both electron configurations
have in common?
F. [Ne] =1s22s22p6
Noble Gas Configuration
(Abbreviated Configuration)
A. Using neon’s configuration and then
adding magnesium’s extra electrons we
can get the noble gas configuration.
B. Ne: 1s22s22p6
C. Mg: 1s22s22p63s2
D. Noble gas configuration Mg: [Ne]3s2
E. Only use noble gases in the brackets.
Which Noble Gas is Used?
A. To figure out which noble gas to use find
the noble gas that is closest to the
element without going over in atomic
number
B. Which noble gas is closest without going
over?
1. Rb [Kr]
2. Cl [Ne]
3. Ra [Rn]
What About the Other
Electrons?
A. To know what to write for the other
electrons that are not included in the
noble gas, understanding the periodic
table is important.
B. The periodic table is organized by blocks
according to the energy sublevels
Blocks of the Periodic Table
A. There are s, p, f, and d blocks of the
periodic table which correspond to the
energy sublevels.
s Block Elements
A. Write the closest noble gas without going over in brackets.
B. Use the row number to get the energy level.
C. Count the number of electrons until you get to the element in
the s block.
Mg: [Ne] 3 s2
1
2
3
4
5
6
7
Mg
Question Time
• Try other s-block elements. Write the
noble gas configuration of the following
elements
• Cs [Xe]6s1
1
2
• Ca [Ar]4s2
3
4
2
• Ba [Xe]6s
5
6
7
p block elements (Between 5-18)
A. Write the closest noble gas without going over in brackets.
B. Use the row number to get the energy level.
C. Write s2 after the row number because you have to go
through the s-block to get to the p-block.
D. Write the row number again
1
E. The write “p” and then count
2
the number of p electrons you
3
must get through to get to your
4
element as a superscript 5
6
7
Si: [Ne] 3s2 3 p2
Si
Question Time
• Try other p-block elements. Write the
noble gas configuration of the following
elements
• N [He]2s22p3
1
• S [Ne]3s23p4 23
4
2
5
• Cl [Ne]3s 3p 5
6
7
d block elements (Between 21-48)
A. Write the closest noble gas without going over in brackets.
B. Use the row number to get the energy level.
C. Write s2 after the row number because you have to go
through the s-block to get to the d-block.
D. Write one less than the row number (d-block elements are
always one less than the row number)**d for down one row
number
E. The write “d” and then
count the number of d
electrons you must get
through to get to your
element as a superscript
Co: [Ar] 4 s2 3 d7
1
2
3
4
5
6
7
3d
4d
5d
6d
Co
Question Time
• Try other d-block elements. Write the
noble gas configuration of the following
elements
23d2
[Ar]4s
• Ti
1
• Zn [Ar]4s23d10 23
3d
23d5 4
[Ar]4s
• Mn
4d
5
6
7
5d
6d
p block elements (Between 31-53)
A. Write the closest noble gas without going over in brackets.
B. Use the row number to get the energy level.
C. Write s2 after the row number because you have to go through the sblock to get to the p-block.
D. Write one less than the row number (d-block elements are always one
less than the row number)**d for down one row number
E. The write “d” and then count the number of d electrons you must get
through to get to your element as a superscript
F. Write the row number again
and “p” and count over the
number of p electrons until
you get to your element
Br: [Ar] 4 s2 3 d10 4p5
1
2
3
4
5
6
7
3d
4d
5d
6d
Br
Question Time
• Try other p-block elements. Write the
noble gas configuration of the following
elements
• Sn[Kr]5s24d105p2
23d104p4 1
[Ar]4s
2
• Se
3
4
5
6
7